index : litmus-rt.git	archive/unc-master-3.0 archived-2013.1 archived-private-master archived-semi-part demo ecrts-pgm-final ecrts14-pgm-final gpusync-rtss12 gpusync/staging linux-tip litmus2008-patch-series master pgm prop/litmus-signals prop/robust-tie-break staging test tracing-devel v2.6.34-with-arm-patches v2015.1 wip-2011.2-bbb wip-2011.2-bbb-trace wip-2012.3-gpu wip-2012.3-gpu-preport wip-2012.3-gpu-rtss13 wip-2012.3-gpu-sobliv-budget-w-kshark wip-aedzl-final wip-aedzl-revised wip-arbit-deadline wip-aux-tasks wip-bbb wip-bbb-prio-don wip-better-break wip-binary-heap wip-budget wip-color wip-color-jlh wip-d10-hz1000 wip-default-clustering wip-dissipation-jerickso wip-dissipation2-jerickso wip-ecrts14-pgm wip-edf-hsb wip-edf-os wip-edf-tie-break wip-edzl-critique wip-edzl-final wip-edzl-revised wip-events wip-extra-debug wip-fix-switch-jerickso wip-fix3 wip-fmlp-dequeue wip-ft-irq-flag wip-gpu-cleanup wip-gpu-interrupts wip-gpu-rtas12 wip-gpu-rtss12 wip-gpu-rtss12-srp wip-gpusync-merge wip-ikglp wip-k-fmlp wip-kernel-coloring wip-kernthreads wip-klmirqd-to-aux wip-kshark wip-litmus-3.2 wip-litmus2011.2 wip-litmus3.0-2011.2 wip-master-2.6.33-rt wip-mc wip-mc-bipasa wip-mc-jerickso wip-mc2-cache-slack wip-mcrit-mac wip-merge-3.0 wip-merge-v3.0 wip-migration-affinity wip-mmap-uncache wip-modechange wip-nested-locking wip-omlp-gedf wip-pai wip-percore-lib wip-performance wip-pgm wip-pgm-split wip-pm-ovd wip-prio-inh wip-prioq-dgl wip-refactored-gedf wip-release-master-fix wip-robust-tie-break wip-rt-kshark wip-rtas12-pgm wip-semi-part wip-semi-part-edfos-jerickso wip-shared-lib wip-shared-lib2 wip-shared-mem wip-splitting-jerickso wip-splitting-omlp-jerickso wip-stage-binheap wip-sun-port wip-timer-trace wip-tracepoints
	The LITMUS^RT kernel.	Bjoern Brandenburg

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Branch	Commit message	Author	Age
archive/unc-master-3.0	P-FP: fix BUG_ON releated to priority inheritance	Bjoern Brandenburg	13 years
archived-2013.1	uncachedev: mmap memory that is not cached by CPUs	Glenn Elliott	12 years
archived-private-master	Merge branch 'wip-2.6.34' into old-private-master	Andrea Bastoni	15 years
archived-semi-part	Merge branch 'wip-semi-part' of ssh://cvs/cvs/proj/litmus/repo/litmus2010 int...	Andrea Bastoni	15 years
demo	Further refinements	Jonathan Herman	14 years
ecrts-pgm-final	Merge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...	Glenn Elliott	12 years
ecrts14-pgm-final	Merge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...	Glenn Elliott	12 years
gpusync-rtss12	Final GPUSync implementation.	Glenn Elliott	12 years
gpusync/staging	Rename IKGLP R2DGLP.	Glenn Elliott	12 years
linux-tip	Merge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/p...	Linus Torvalds	15 years
litmus2008-patch-series	add i386 feather-trace implementation	Bjoern B. Brandenburg	16 years
master	PSN-EDF: use inferred_sporadic_job_release_at	Bjoern Brandenburg	9 years
pgm	make it compile	Glenn Elliott	12 years
prop/litmus-signals	Infrastructure for Litmus signals.	Glenn Elliott	13 years
prop/robust-tie-break	Fixed bug in edf_higher_prio().	Glenn Elliott	13 years
staging	Fix tracepoint compilation error	Felipe Cerqueira	13 years
test	9/23/2016	Namhoon Kim	9 years
tracing-devel	Test kernel tracing events capabilities	Andrea Bastoni	16 years
v2.6.34-with-arm-patches	smsc911x: Add spinlocks around registers access	Catalin Marinas	15 years
v2015.1	Add ARM syscall def for get_current_budget	Bjoern Brandenburg	10 years
wip-2011.2-bbb	Litmus core: simplify np-section protocol	Bjoern B. Brandenburg	14 years
wip-2011.2-bbb-trace	Refactor sched_trace_log_message() -> debug_trace_log_message()	Andrea Bastoni	14 years
wip-2012.3-gpu	SOBLIV draining support for C-EDF.	Glenn Elliott	12 years
wip-2012.3-gpu-preport	pick up last C-RM file	Glenn Elliott	12 years
wip-2012.3-gpu-rtss13	Fix critical bug in GPU tracker.	Glenn Elliott	12 years
wip-2012.3-gpu-sobliv-budget-w-kshark	Proper sobliv draining and many bug fixes.	Glenn Elliott	12 years
wip-aedzl-final	Make it easier to compile AEDZL interfaces in liblitmus.	Glenn Elliott	15 years
wip-aedzl-revised	Add sched_trace data for Apative EDZL	Glenn Elliott	15 years
wip-arbit-deadline	Fix compilation bug.	Glenn Elliott	13 years
wip-aux-tasks	Description of refined aux task inheritance.	Glenn Elliott	13 years
wip-bbb	GSN-EDF & Core: improve debug TRACE'ing for NP sections	Bjoern B. Brandenburg	14 years
wip-bbb-prio-don	use correct timestamp	Bjoern B. Brandenburg	14 years
wip-better-break	Implement hash-based EDF tie-breaking.	Glenn Elliott	13 years
wip-binary-heap	Make C-EDF work with simplified binheap_delete	Glenn Elliott	13 years
wip-budget	Added support for choices in budget policy enforcement.	Glenn Elliott	15 years
wip-color	Summarize schedulability with final record	Jonathan Herman	13 years
wip-color-jlh	sched_color: Fixed two bugs causing crashing on experiment restart and a rare...	Jonathan Herman	13 years
wip-d10-hz1000	Enable HZ=1000 on District 10	Bjoern B. Brandenburg	15 years
wip-default-clustering	Feature: Make default C-EDF clustering compile-time configurable.	Glenn Elliott	15 years
wip-dissipation-jerickso	Update from 2.6.36 to 2.6.36.4	Jeremy Erickson	11 years
wip-dissipation2-jerickso	Update 2.6.36 to 2.6.36.4	Jeremy Erickson	11 years
wip-ecrts14-pgm	Merge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...	Glenn Elliott	12 years
wip-edf-hsb	last tested version	Jonathan Herman	14 years
wip-edf-os	Lookup table EDF-os	Jeremy Erickson	12 years
wip-edf-tie-break	Merge branch 'wip-edf-tie-break' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus...	Glenn Elliott	13 years
wip-edzl-critique	Use hr_timer's active checks instead of having own flag.	Glenn Elliott	15 years
wip-edzl-final	Implementation of the EDZL scheduler.	Glenn Elliott	15 years
wip-edzl-revised	Clean up comments.	Glenn Elliott	15 years
wip-events	Added support for tracing arbitrary actions.	Jonathan Herman	15 years
wip-extra-debug	DBG: add additional tracing	Bjoern B. Brandenburg	15 years
wip-fix-switch-jerickso	Attempt to fix race condition with plugin switching	Jeremy Erickson	15 years
wip-fix3	sched: show length of runqueue clock deactivation in /proc/sched_debug	Bjoern B. Brandenburg	15 years
wip-fmlp-dequeue	Improve FMLP queue management.	Glenn Elliott	14 years
wip-ft-irq-flag	Feather-Trace: keep track of interrupt-related interference.	Bjoern B. Brandenburg	14 years
wip-gpu-cleanup	Enable sched_trace log injection from userspace	Glenn Elliott	13 years
wip-gpu-interrupts	Remove option for threading of all softirqs.	Glenn Elliott	14 years
wip-gpu-rtas12	Generalized GPU cost predictors + EWMA. (untested)	Glenn Elliott	13 years
wip-gpu-rtss12	Final GPUSync implementation.	Glenn Elliott	13 years
wip-gpu-rtss12-srp	experimental changes to support GPUs under SRP	Glenn Elliott	13 years
wip-gpusync-merge	Cleanup priority tracking for budget enforcement.	Glenn Elliott	12 years
wip-ikglp	Move RSM and IKGLP imp. to own .c files	Glenn Elliott	13 years
wip-k-fmlp	Merge branch 'mpi-master' into wip-k-fmlp	Glenn Elliott	14 years
wip-kernel-coloring	Added recolor syscall	Namhoon Kim	8 years
wip-kernthreads	Kludge work-queue processing into klitirqd.	Glenn Elliott	15 years
wip-klmirqd-to-aux	Allow klmirqd threads to be given names.	Glenn Elliott	13 years
wip-kshark	Merge branch 'mpi-staging' into wip-kshark	Jonathan Herman	13 years
wip-litmus-3.2	Merge commit 'v3.2' into litmus-staging	Andrea Bastoni	13 years
wip-litmus2011.2	Cleanup: Coding conformance for affinity stuff.	Glenn Elliott	14 years
wip-litmus3.0-2011.2	Feather-Trace: keep track of interrupt-related interference.	Bjoern B. Brandenburg	14 years
wip-master-2.6.33-rt	Avoid deadlock when switching task policy to BACKGROUND (ugly)	Andrea Bastoni	15 years
wip-mc	Removed ARM-specific hacks which disabled less common mixed-criticality featu...	Jonathan Herman	12 years
wip-mc-bipasa	MC-EDF added	bipasa chattopadhyay	13 years
wip-mc-jerickso	Split C/D queues	Jeremy Erickson	15 years
wip-mc2-cache-slack	Manually patched mc^2 related code	Ming Yang	10 years
wip-mcrit-mac	cosmetic	Mac Mollison	15 years
wip-merge-3.0	Prevent Linux to send IPI and queue tasks on remote CPUs.	Andrea Bastoni	14 years
wip-merge-v3.0	Prevent Linux to send IPI and queue tasks on remote CPUs.	Andrea Bastoni	14 years
wip-migration-affinity	NULL affinity dereference in C-EDF.	Glenn Elliott	14 years
wip-mmap-uncache	share branch with others	Glenn Elliott	13 years
wip-modechange	RTSS 2017 submission	Namhoon Kim	8 years
wip-nested-locking	Appears to be working.	Bryan Ward	12 years
wip-omlp-gedf	First implementation of G-OMLP.	Glenn Elliott	15 years
wip-pai	Some cleanup of PAI	Glenn Elliott	14 years
wip-percore-lib	9/21/2016	Namhoon Kim	9 years
wip-performance	CONFIG_DONT_PREEMPT_ON_TIE: Don't preeempt a scheduled task on priority tie.	Glenn Elliott	14 years
wip-pgm	Add PGM support to C-FL	Glenn Elliott	12 years
wip-pgm-split	First draft of C-FL-split	Namhoon Kim	12 years
wip-pm-ovd	Add preemption-and-migration overhead tracing support	Andrea Bastoni	15 years
wip-prio-inh	P-EDF updated to use the generic pi framework.	Glenn Elliott	15 years
wip-prioq-dgl	BUG FIX: Support DGLs with PRIOQ_MUTEX	Glenn Elliott	13 years
wip-refactored-gedf	Generalizd architecture for GEDF-style scheduelrs to reduce code redundancy.	Glenn Elliott	15 years
wip-release-master-fix	bugfix: release master CPU must signal task was picked	Bjoern B. Brandenburg	14 years
wip-robust-tie-break	EDF priority tie-breaks.	Glenn Elliott	13 years
wip-rt-kshark	Move task time accounting into the complete_job method.	Jonathan Herman	13 years
wip-rtas12-pgm	Scheduling of PGM jobs.	Glenn Elliott	13 years
wip-semi-part	Fix compile error with newer GCC	Jeremy Erickson	12 years
wip-semi-part-edfos-jerickso	Use initial CPU set by client	Jeremy Erickson	12 years
wip-shared-lib	TODO: Fix condition checks in replicate_page_move_mapping()	Namhoon Kim	9 years
wip-shared-lib2	RTAS 2017 Submission ver.	Namhoon Kim	9 years
wip-shared-mem	Initial commit for shared library	Namhoon Kim	9 years
wip-splitting-jerickso	Fix release behavior	Jeremy Erickson	13 years
wip-splitting-omlp-jerickso	Bjoern's Dissertation Code with Priority Donation	Jeremy Erickson	13 years
wip-stage-binheap	An efficient binary heap implementation.	Glenn Elliott	13 years
wip-sun-port	Dynamic memory allocation and clean exit for FeatherTrace	Christopher Kenna	15 years
wip-timer-trace	bugfix: C-EDF, clear scheduled field of the correct CPU upon task_exit	Andrea Bastoni	15 years
wip-tracepoints	Add kernel-style events for sched_trace_XXX() functions	Andrea Bastoni	14 years
Tag	Download	Author	Age
2015.1	commit 8e51b37822...	Bjoern Brandenburg	10 years
2013.1	commit bcaacec1ca...	Glenn Elliott	12 years
2012.3	commit c158b5fbe4...	Jonathan Herman	13 years
2012.2	commit b53c479a0f...	Glenn Elliott	13 years
2012.1	commit 83b11ea1c6...	Bjoern B. Brandenburg	14 years
rtas12-mc-beta-exp	commit 8e236ee20f...	Christopher Kenna	14 years
2011.1	commit d11808b5c6...	Christopher Kenna	15 years
v2.6.37-rc4	commit e8a7e48bb2...	Linus Torvalds	15 years
v2.6.37-rc3	commit 3561d43fd2...	Linus Torvalds	15 years
v2.6.37-rc2	commit e53beacd23...	Linus Torvalds	15 years
v2.6.37-rc1	commit c8ddb2713c...	Linus Torvalds	15 years
v2.6.36	commit f6f94e2ab1...	Linus Torvalds	15 years
2010.2	commit 5c5456402d...	Bjoern B. Brandenburg	15 years
v2.6.36-rc8	commit cd07202cc8...	Linus Torvalds	15 years
v2.6.36-rc7	commit cb655d0f3d...	Linus Torvalds	15 years
v2.6.36-rc6	commit 899611ee7d...	Linus Torvalds	15 years
v2.6.36-rc5	commit b30a3f6257...	Linus Torvalds	15 years
v2.6.36-rc4	commit 49553c2ef8...	Linus Torvalds	15 years
v2.6.36-rc3	commit 2bfc96a127...	Linus Torvalds	15 years
v2.6.36-rc2	commit 76be97c1fc...	Linus Torvalds	15 years
v2.6.36-rc1	commit da5cabf80e...	Linus Torvalds	15 years
v2.6.35	commit 9fe6206f40...	Linus Torvalds	15 years
v2.6.35-rc6	commit b37fa16e78...	Linus Torvalds	15 years
v2.6.35-rc5	commit 1c5474a65b...	Linus Torvalds	15 years
v2.6.35-rc4	commit 815c4163b6...	Linus Torvalds	15 years
v2.6.35-rc3	commit 7e27d6e778...	Linus Torvalds	15 years
v2.6.35-rc2	commit e44a21b726...	Linus Torvalds	15 years
v2.6.35-rc1	commit 67a3e12b05...	Linus Torvalds	15 years
2010.1	commit 7c1ff4c544...	Andrea Bastoni	15 years
v2.6.34	commit e40152ee1e...	Linus Torvalds	15 years
v2.6.33.4	commit 4640b4e7d9...	Greg Kroah-Hartman	15 years
v2.6.34-rc7	commit b57f95a382...	Linus Torvalds	15 years
v2.6.34-rc6	commit 66f41d4c5c...	Linus Torvalds	15 years
v2.6.33.3	commit 3e7ad8ed97...	Greg Kroah-Hartman	15 years
v2.6.34-rc5	commit 01bf0b6457...	Linus Torvalds	15 years
v2.6.34-rc4	commit 0d0fb0f9c5...	Linus Torvalds	15 years
v2.6.33.2	commit 19f00f070c...	Greg Kroah-Hartman	15 years
v2.6.34-rc3	commit 2eaa9cfdf3...	Linus Torvalds	15 years
v2.6.34-rc2	commit 220bf991b0...	Linus Torvalds	16 years
v2.6.33.1	commit dbdafe5ccf...	Greg Kroah-Hartman	16 years
v2.6.34-rc1	commit 57d54889cd...	Linus Torvalds	16 years
v2.6.33	commit 60b341b778...	Linus Torvalds	16 years
v2.6.33-rc8	commit 724e6d3fe8...	Linus Torvalds	16 years
v2.6.33-rc7	commit 29275254ca...	Linus Torvalds	16 years
v2.6.33-rc6	commit abe94c756c...	Linus Torvalds	16 years
v2.6.33-rc5	commit 92dcffb916...	Linus Torvalds	16 years
v2.6.33-rc4	commit 7284ce6c9f...	Linus Torvalds	16 years
v2.6.33-rc3	commit 74d2e4f8d7...	Linus Torvalds	16 years
v2.6.33-rc2	commit 6b7b284958...	Linus Torvalds	16 years
v2.6.33-rc1	commit 55639353a0...	Linus Torvalds	16 years
v2.6.32	commit 22763c5cf3...	Linus Torvalds	16 years
v2.6.32-rc8	commit 648f4e3e50...	Linus Torvalds	16 years
v2.6.32-rc7	commit 156171c71a...	Linus Torvalds	16 years
v2.6.32-rc6	commit b419148e56...	Linus Torvalds	16 years
v2.6.32-rc5	commit 012abeea66...	Linus Torvalds	16 years
v2.6.32-rc4	commit 161291396e...	Linus Torvalds	16 years
v2.6.32-rc3	commit 374576a8b6...	Linus Torvalds	16 years
v2.6.32-rc1	commit 17d857be64...	Linus Torvalds	16 years
v2.6.32-rc2	commit 17d857be64...	Linus Torvalds	16 years
v2.6.31	commit 74fca6a428...	Linus Torvalds	16 years
v2.6.31-rc9	commit e07cccf404...	Linus Torvalds	16 years
v2.6.31-rc8	commit 326ba5010a...	Linus Torvalds	16 years
v2.6.31-rc7	commit 422bef879e...	Linus Torvalds	16 years
v2.6.31-rc6	commit 64f1607ffb...	Linus Torvalds	16 years
v2.6.31-rc5	commit ed680c4ad4...	Linus Torvalds	16 years
v2.6.31-rc4	commit 4be3bd7849...	Linus Torvalds	16 years
v2.6.31-rc3	commit 6847e154e3...	Linus Torvalds	16 years
v2.6.31-rc2	commit 8e4a718ff3...	Linus Torvalds	16 years
v2.6.31-rc1	commit 28d0325ce6...	Linus Torvalds	16 years
v2.6.30	commit 07a2039b8e...	Linus Torvalds	16 years
v2.6.30-rc8	commit 9fa7eb283c...	Linus Torvalds	16 years
v2.6.30-rc7	commit 59a3759d0f...	Linus Torvalds	16 years
v2.6.30-rc6	commit 1406de8e11...	Linus Torvalds	16 years
v2.6.30-rc5	commit 091bf7624d...	Linus Torvalds	16 years
v2.6.30-rc4	commit 091438dd56...	Linus Torvalds	16 years
v2.6.30-rc3	commit 0910697403...	Linus Torvalds	16 years
v2.6.30-rc2	commit 0882e8dd3a...	Linus Torvalds	16 years
v2.6.30-rc1	commit 577c9c456f...	Linus Torvalds	16 years
v2.6.29	commit 8e0ee43bc2...	Linus Torvalds	16 years
v2.6.29-rc8	commit 041b62374c...	Linus Torvalds	17 years
v2.6.29-rc7	commit fec6c6fec3...	Linus Torvalds	17 years
v2.6.29-rc6	commit 20f4d6c3a2...	Linus Torvalds	17 years
v2.6.29-rc5	commit d2f8d7ee1a...	Linus Torvalds	17 years
v2.6.29-rc4	commit 8e4921515c...	Linus Torvalds	17 years
v2.6.29-rc3	commit 18e352e4a7...	Linus Torvalds	17 years
v2.6.29-rc2	commit 1de9e8e70f...	Linus Torvalds	17 years
v2.6.29-rc1	commit c59765042f...	Linus Torvalds	17 years
v2.6.28	commit 4a6908a3a0...	Linus Torvalds	17 years
v2.6.28-rc9	commit 929096fe9f...	Linus Torvalds	17 years
v2.6.28-rc8	commit 8b1fae4e42...	Linus Torvalds	17 years
v2.6.28-rc7	commit 061e41fdb5...	Linus Torvalds	17 years
v2.6.28-rc6	commit 13d428afc0...	Linus Torvalds	17 years
v2.6.28-rc5	commit 9bf1a2445f...	Linus Torvalds	17 years
v2.6.28-rc4	commit f7160c7573...	Linus Torvalds	17 years
v2.6.28-rc3	commit 45beca08dd...	Linus Torvalds	17 years
v2.6.28-rc2	commit 0173a3265b...	Linus Torvalds	17 years
v2.6.28-rc1	commit 57f8f7b60d...	Linus Torvalds	17 years
v2.6.27	commit 3fa8749e58...	Linus Torvalds	17 years
v2.6.27-rc9	commit 4330ed8ed4...	Linus Torvalds	17 years
v2.6.27-rc8	commit 94aca1dac6...	Linus Torvalds	17 years
v2.6.27-rc7	commit 72d31053f6...	Linus Torvalds	17 years
v2.6.27-rc6	commit adee14b2e1...	Linus Torvalds	17 years
v2.6.27-rc5	commit 24342c34a0...	Linus Torvalds	17 years
v2.6.27-rc4	commit 6a55617ed5...	Linus Torvalds	17 years
v2.6.27-rc3	commit 30a2f3c60a...	Linus Torvalds	17 years
v2.6.27-rc2	commit 0967d61ea0...	Linus Torvalds	17 years
v2.6.27-rc1	commit 6e86841d05...	Linus Torvalds	17 years
v2.6.26	commit bce7f793da...	Linus Torvalds	17 years
v2.6.26-rc9	commit b7279469d6...	Linus Torvalds	17 years
v2.6.26-rc8	commit 543cf4cb3f...	Linus Torvalds	17 years
v2.6.26-rc7	commit d70ac829b7...	Linus Torvalds	17 years
v2.6.26-rc6	commit 5dd34572ad...	Linus Torvalds	17 years
v2.6.26-rc5	commit 53c8ba9540...	Linus Torvalds	17 years
v2.6.26-rc4	commit e490517a03...	Linus Torvalds	17 years
v2.6.26-rc3	commit b8291ad07a...	Linus Torvalds	17 years
v2.6.26-rc2	commit 492c2e476e...	Linus Torvalds	17 years
v2.6.26-rc1	commit 2ddcca36c8...	Linus Torvalds	17 years
v2.6.25	commit 4b119e21d0...	Linus Torvalds	17 years
v2.6.25-rc9	commit 120dd64cac...	Linus Torvalds	17 years
v2.6.25-rc8	commit 0e81a8ae37...	Linus Torvalds	17 years
v2.6.25-rc7	commit 05dda977f2...	Linus Torvalds	17 years
v2.6.25-rc6	commit a978b30af3...	Linus Torvalds	18 years
v2.6.25-rc5	commit cdeeeae056...	Linus Torvalds	18 years
v2.6.25-rc4	commit 29e8c3c304...	Linus Torvalds	18 years
v2.6.25-rc3	commit bfa274e243...	Linus Torvalds	18 years
v2.6.25-rc2	commit 101142c37b...	Linus Torvalds	18 years
v2.6.25-rc1	commit 19af35546d...	Linus Torvalds	18 years
v2.6.24	commit 49914084e7...	Linus Torvalds	18 years
v2.6.24-rc8	commit cbd9c88369...	Linus Torvalds	18 years
v2.6.24-rc7	commit 3ce5445046...	Linus Torvalds	18 years
v2.6.24-rc6	commit ea67db4cdb...	Linus Torvalds	18 years
v2.6.24-rc5	commit 82d29bf6dc...	Linus Torvalds	18 years
v2.6.24-rc4	commit 09b56adc98...	Linus Torvalds	18 years
v2.6.24-rc3	commit d9f8bcbf67...	Linus Torvalds	18 years
v2.6.24-rc2	commit dbeeb816e8...	Linus Torvalds	18 years
v2.6.24-rc1	commit c9927c2bf4...	Linus Torvalds	18 years
v2.6.23	commit bbf25010f1...	Linus Torvalds	18 years
v2.6.23-rc9	commit 3146b39c18...	Linus Torvalds	18 years
v2.6.23-rc8	commit 4942de4a0e...	Linus Torvalds	18 years
v2.6.23-rc7	commit 81cfe79b9c...	Linus Torvalds	18 years
v2.6.23-rc6	commit 0d4cbb5e7f...	Linus Torvalds	18 years
v2.6.23-rc5	commit 40ffbfad6b...	Linus Torvalds	18 years
v2.6.23-rc4	commit b07d68b5ca...	Linus Torvalds	18 years
v2.6.23-rc3	commit 39d3520c92...	Linus Torvalds	18 years
v2.6.23-rc2	commit d4ac2477fa...	Linus Torvalds	18 years
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generated by cgit v1.2.2 (git 2.25.0) at 2025-09-16 14:23:35 -0400

/*
 * Driver for OHCI 1394 controllers
 *
 * Copyright (C) 2003-2006 Kristian Hoegsberg <krh@bitplanet.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/firewire.h>
#include <linux/firewire-constants.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/workqueue.h>

#include <asm/byteorder.h>
#include <asm/page.h>
#include <asm/system.h>

#ifdef CONFIG_PPC_PMAC
#include <asm/pmac_feature.h>
#endif

#include "core.h"
#include "ohci.h"

#define DESCRIPTOR_OUTPUT_MORE		0
#define DESCRIPTOR_OUTPUT_LAST		(1 << 12)
#define DESCRIPTOR_INPUT_MORE		(2 << 12)
#define DESCRIPTOR_INPUT_LAST		(3 << 12)
#define DESCRIPTOR_STATUS		(1 << 11)
#define DESCRIPTOR_KEY_IMMEDIATE	(2 << 8)
#define DESCRIPTOR_PING			(1 << 7)
#define DESCRIPTOR_YY			(1 << 6)
#define DESCRIPTOR_NO_IRQ		(0 << 4)
#define DESCRIPTOR_IRQ_ERROR		(1 << 4)
#define DESCRIPTOR_IRQ_ALWAYS		(3 << 4)
#define DESCRIPTOR_BRANCH_ALWAYS	(3 << 2)
#define DESCRIPTOR_WAIT			(3 << 0)

struct descriptor {
	__le16 req_count;
	__le16 control;
	__le32 data_address;
	__le32 branch_address;
	__le16 res_count;
	__le16 transfer_status;
} __attribute__((aligned(16)));

#define CONTROL_SET(regs)	(regs)
#define CONTROL_CLEAR(regs)	((regs) + 4)
#define COMMAND_PTR(regs)	((regs) + 12)
#define CONTEXT_MATCH(regs)	((regs) + 16)

#define AR_BUFFER_SIZE	(32*1024)
#define AR_BUFFERS_MIN	DIV_ROUND_UP(AR_BUFFER_SIZE, PAGE_SIZE)
/* we need at least two pages for proper list management */
#define AR_BUFFERS	(AR_BUFFERS_MIN >= 2 ? AR_BUFFERS_MIN : 2)

#define MAX_ASYNC_PAYLOAD	4096
#define MAX_AR_PACKET_SIZE	(16 + MAX_ASYNC_PAYLOAD + 4)
#define AR_WRAPAROUND_PAGES	DIV_ROUND_UP(MAX_AR_PACKET_SIZE, PAGE_SIZE)

struct ar_context {
	struct fw_ohci *ohci;
	struct page *pages[AR_BUFFERS];
	void *buffer;
	struct descriptor *descriptors;
	dma_addr_t descriptors_bus;
	void *pointer;
	unsigned int last_buffer_index;
	u32 regs;
	struct tasklet_struct tasklet;
};

struct context;

typedef int (*descriptor_callback_t)(struct context *ctx,
				     struct descriptor *d,
				     struct descriptor *last);

/*
 * A buffer that contains a block of DMA-able coherent memory used for
 * storing a portion of a DMA descriptor program.
 */
struct descriptor_buffer {
	struct list_head list;
	dma_addr_t buffer_bus;
	size_t buffer_size;
	size_t used;
	struct descriptor buffer[0];
};

struct context {
	struct fw_ohci *ohci;
	u32 regs;
	int total_allocation;
	u32 current_bus;
	bool running;
	bool flushing;

	/*
	 * List of page-sized buffers for storing DMA descriptors.
	 * Head of list contains buffers in use and tail of list contains
	 * free buffers.
	 */
	struct list_head buffer_list;

	/*
	 * Pointer to a buffer inside buffer_list that contains the tail
	 * end of the current DMA program.
	 */
	struct descriptor_buffer *buffer_tail;

	/*
	 * The descriptor containing the branch address of the first
	 * descriptor that has not yet been filled by the device.
	 */
	struct descriptor *last;

	/*
	 * The last descriptor in the DMA program.  It contains the branch
	 * address that must be updated upon appending a new descriptor.
	 */
	struct descriptor *prev;

	descriptor_callback_t callback;

	struct tasklet_struct tasklet;
};

#define IT_HEADER_SY(v)          ((v) <<  0)
#define IT_HEADER_TCODE(v)       ((v) <<  4)
#define IT_HEADER_CHANNEL(v)     ((v) <<  8)
#define IT_HEADER_TAG(v)         ((v) << 14)
#define IT_HEADER_SPEED(v)       ((v) << 16)
#define IT_HEADER_DATA_LENGTH(v) ((v) << 16)

struct iso_context {
	struct fw_iso_context base;
	struct context context;
	void *header;
	size_t header_length;

	u8 sync;
	u8 tags;
};

#define CONFIG_ROM_SIZE 1024

struct fw_ohci {
	struct fw_card card;

	__iomem char *registers;
	int node_id;
	int generation;
	int request_generation;	/* for timestamping incoming requests */
	unsigned quirks;
	unsigned int pri_req_max;
	u32 bus_time;
	bool is_root;
	bool csr_state_setclear_abdicate;
	int n_ir;
	int n_it;
	/*
	 * Spinlock for accessing fw_ohci data.  Never call out of
	 * this driver with this lock held.
	 */
	spinlock_t lock;

	struct mutex phy_reg_mutex;

	void *misc_buffer;
	dma_addr_t misc_buffer_bus;

	struct ar_context ar_request_ctx;
	struct ar_context ar_response_ctx;
	struct context at_request_ctx;
	struct context at_response_ctx;

	u32 it_context_support;
	u32 it_context_mask;     /* unoccupied IT contexts */
	struct iso_context *it_context_list;
	u64 ir_context_channels; /* unoccupied channels */
	u32 ir_context_support;
	u32 ir_context_mask;     /* unoccupied IR contexts */
	struct iso_context *ir_context_list;
	u64 mc_channels; /* channels in use by the multichannel IR context */
	bool mc_allocated;

	__be32    *config_rom;
	dma_addr_t config_rom_bus;
	__be32    *next_config_rom;
	dma_addr_t next_config_rom_bus;
	__be32     next_header;

	__le32    *self_id_cpu;
	dma_addr_t self_id_bus;
	struct work_struct bus_reset_work;

	u32 self_id_buffer[512];
};

static inline struct fw_ohci *fw_ohci(struct fw_card *card)
{
	return container_of(card, struct fw_ohci, card);
}

#define IT_CONTEXT_CYCLE_MATCH_ENABLE	0x80000000
#define IR_CONTEXT_BUFFER_FILL		0x80000000
#define IR_CONTEXT_ISOCH_HEADER		0x40000000
#define IR_CONTEXT_CYCLE_MATCH_ENABLE	0x20000000
#define IR_CONTEXT_MULTI_CHANNEL_MODE	0x10000000
#define IR_CONTEXT_DUAL_BUFFER_MODE	0x08000000

#define CONTEXT_RUN	0x8000
#define CONTEXT_WAKE	0x1000
#define CONTEXT_DEAD	0x0800
#define CONTEXT_ACTIVE	0x0400

#define OHCI1394_MAX_AT_REQ_RETRIES	0xf
#define OHCI1394_MAX_AT_RESP_RETRIES	0x2
#define OHCI1394_MAX_PHYS_RESP_RETRIES	0x8

#define OHCI1394_REGISTER_SIZE		0x800
#define OHCI1394_PCI_HCI_Control	0x40
#define SELF_ID_BUF_SIZE		0x800
#define OHCI_TCODE_PHY_PACKET		0x0e
#define OHCI_VERSION_1_1		0x010010

static char ohci_driver_name[] = KBUILD_MODNAME;

#define PCI_DEVICE_ID_AGERE_FW643	0x5901
#define PCI_DEVICE_ID_JMICRON_JMB38X_FW	0x2380
#define PCI_DEVICE_ID_TI_TSB12LV22	0x8009
#define PCI_DEVICE_ID_TI_TSB12LV26	0x8020
#define PCI_DEVICE_ID_TI_TSB82AA2	0x8025
#define PCI_VENDOR_ID_PINNACLE_SYSTEMS	0x11bd

#define QUIRK_CYCLE_TIMER		1
#define QUIRK_RESET_PACKET		2
#define QUIRK_BE_HEADERS		4
#define QUIRK_NO_1394A			8
#define QUIRK_NO_MSI			16
#define QUIRK_TI_SLLZ059		32

/* In case of multiple matches in ohci_quirks[], only the first one is used. */
static const struct {
	unsigned short vendor, device, revision, flags;
} ohci_quirks[] = {
	{PCI_VENDOR_ID_AL, PCI_ANY_ID, PCI_ANY_ID,
		QUIRK_CYCLE_TIMER},

	{PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_UNI_N_FW, PCI_ANY_ID,
		QUIRK_BE_HEADERS},

	{PCI_VENDOR_ID_ATT, PCI_DEVICE_ID_AGERE_FW643, 6,
		QUIRK_NO_MSI},

	{PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB38X_FW, PCI_ANY_ID,
		QUIRK_NO_MSI},

	{PCI_VENDOR_ID_NEC, PCI_ANY_ID, PCI_ANY_ID,
		QUIRK_CYCLE_TIMER},

	{PCI_VENDOR_ID_O2, PCI_ANY_ID, PCI_ANY_ID,
		QUIRK_NO_MSI},

	{PCI_VENDOR_ID_RICOH, PCI_ANY_ID, PCI_ANY_ID,
		QUIRK_CYCLE_TIMER},

	{PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_TSB12LV22, PCI_ANY_ID,
		QUIRK_CYCLE_TIMER | QUIRK_RESET_PACKET | QUIRK_NO_1394A},

	{PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_TSB12LV26, PCI_ANY_ID,
		QUIRK_RESET_PACKET | QUIRK_TI_SLLZ059},

	{PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_TSB82AA2, PCI_ANY_ID,
		QUIRK_RESET_PACKET | QUIRK_TI_SLLZ059},

	{PCI_VENDOR_ID_TI, PCI_ANY_ID, PCI_ANY_ID,
		QUIRK_RESET_PACKET},

	{PCI_VENDOR_ID_VIA, PCI_ANY_ID, PCI_ANY_ID,
		QUIRK_CYCLE_TIMER | QUIRK_NO_MSI},
};

/* This overrides anything that was found in ohci_quirks[]. */
static int param_quirks;
module_param_named(quirks, param_quirks, int, 0644);
MODULE_PARM_DESC(quirks, "Chip quirks (default = 0"
	", nonatomic cycle timer = "	__stringify(QUIRK_CYCLE_TIMER)
	", reset packet generation = "	__stringify(QUIRK_RESET_PACKET)
	", AR/selfID endianess = "	__stringify(QUIRK_BE_HEADERS)
	", no 1394a enhancements = "	__stringify(QUIRK_NO_1394A)
	", disable MSI = "		__stringify(QUIRK_NO_MSI)
	", TI SLLZ059 erratum = "	__stringify(QUIRK_TI_SLLZ059)
	")");

#define OHCI_PARAM_DEBUG_AT_AR		1
#define OHCI_PARAM_DEBUG_SELFIDS	2
#define OHCI_PARAM_DEBUG_IRQS		4
#define OHCI_PARAM_DEBUG_BUSRESETS	8 /* only effective before chip init */

static int param_debug;
module_param_named(debug, param_debug, int, 0644);
MODULE_PARM_DESC(debug, "Verbose logging (default = 0"
	", AT/AR events = "	__stringify(OHCI_PARAM_DEBUG_AT_AR)
	", self-IDs = "		__stringify(OHCI_PARAM_DEBUG_SELFIDS)
	", IRQs = "		__stringify(OHCI_PARAM_DEBUG_IRQS)
	", busReset events = "	__stringify(OHCI_PARAM_DEBUG_BUSRESETS)
	", or a combination, or all = -1)");

static void log_irqs(struct fw_ohci *ohci, u32 evt)
{
	if (likely(!(param_debug &
			(OHCI_PARAM_DEBUG_IRQS | OHCI_PARAM_DEBUG_BUSRESETS))))
		return;

	if (!(param_debug & OHCI_PARAM_DEBUG_IRQS) &&
	    !(evt & OHCI1394_busReset))
		return;

	dev_notice(ohci->card.device,
	    "IRQ %08x%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", evt,
	    evt & OHCI1394_selfIDComplete	? " selfID"		: "",
	    evt & OHCI1394_RQPkt		? " AR_req"		: "",
	    evt & OHCI1394_RSPkt		? " AR_resp"		: "",
	    evt & OHCI1394_reqTxComplete	? " AT_req"		: "",
	    evt & OHCI1394_respTxComplete	? " AT_resp"		: "",
	    evt & OHCI1394_isochRx		? " IR"			: "",
	    evt & OHCI1394_isochTx		? " IT"			: "",
	    evt & OHCI1394_postedWriteErr	? " postedWriteErr"	: "",
	    evt & OHCI1394_cycleTooLong		? " cycleTooLong"	: "",
	    evt & OHCI1394_cycle64Seconds	? " cycle64Seconds"	: "",
	    evt & OHCI1394_cycleInconsistent	? " cycleInconsistent"	: "",
	    evt & OHCI1394_regAccessFail	? " regAccessFail"	: "",
	    evt & OHCI1394_unrecoverableError	? " unrecoverableError"	: "",
	    evt & OHCI1394_busReset		? " busReset"		: "",
	    evt & ~(OHCI1394_selfIDComplete | OHCI1394_RQPkt |
		    OHCI1394_RSPkt | OHCI1394_reqTxComplete |
		    OHCI1394_respTxComplete | OHCI1394_isochRx |
		    OHCI1394_isochTx | OHCI1394_postedWriteErr |
		    OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds |
		    OHCI1394_cycleInconsistent |
		    OHCI1394_regAccessFail | OHCI1394_busReset)
						? " ?"			: "");
}

static const char *speed[] = {
	[0] = "S100", [1] = "S200", [2] = "S400",    [3] = "beta",
};
static const char *power[] = {
	[0] = "+0W",  [1] = "+15W", [2] = "+30W",    [3] = "+45W",
	[4] = "-3W",  [5] = " ?W",  [6] = "-3..-6W", [7] = "-3..-10W",
};
static const char port[] = { '.', '-', 'p', 'c', };

static char _p(u32 *s, int shift)
{
	return port[*s >> shift & 3];
}

static void log_selfids(struct fw_ohci *ohci, int generation, int self_id_count)
{
	u32 *s;

	if (likely(!(param_debug & OHCI_PARAM_DEBUG_SELFIDS)))
		return;

	dev_notice(ohci->card.device,
		   "%d selfIDs, generation %d, local node ID %04x\n",
		   self_id_count, generation, ohci->node_id);

	for (s = ohci->self_id_buffer; self_id_count--; ++s)
		if ((*s & 1 << 23) == 0)
			dev_notice(ohci->card.device,
			    "selfID 0: %08x, phy %d [%c%c%c] "
			    "%s gc=%d %s %s%s%s\n",
			    *s, *s >> 24 & 63, _p(s, 6), _p(s, 4), _p(s, 2),
			    speed[*s >> 14 & 3], *s >> 16 & 63,
			    power[*s >> 8 & 7], *s >> 22 & 1 ? "L" : "",
			    *s >> 11 & 1 ? "c" : "", *s & 2 ? "i" : "");
		else
			dev_notice(ohci->card.device,
			    "selfID n: %08x, phy %d [%c%c%c%c%c%c%c%c]\n",
			    *s, *s >> 24 & 63,
			    _p(s, 16), _p(s, 14), _p(s, 12), _p(s, 10),
			    _p(s,  8), _p(s,  6), _p(s,  4), _p(s,  2));
}

static const char *evts[] = {
	[0x00] = "evt_no_status",	[0x01] = "-reserved-",
	[0x02] = "evt_long_packet",	[0x03] = "evt_missing_ack",
	[0x04] = "evt_underrun",	[0x05] = "evt_overrun",
	[0x06] = "evt_descriptor_read",	[0x07] = "evt_data_read",
	[0x08] = "evt_data_write",	[0x09] = "evt_bus_reset",
	[0x0a] = "evt_timeout",		[0x0b] = "evt_tcode_err",
	[0x0c] = "-reserved-",		[0x0d] = "-reserved-",
	[0x0e] = "evt_unknown",		[0x0f] = "evt_flushed",
	[0x10] = "-reserved-",		[0x11] = "ack_complete",
	[0x12] = "ack_pending ",	[0x13] = "-reserved-",
	[0x14] = "ack_busy_X",		[0x15] = "ack_busy_A",
	[0x16] = "ack_busy_B",		[0x17] = "-reserved-",
	[0x18] = "-reserved-",		[0x19] = "-reserved-",
	[0x1a] = "-reserved-",		[0x1b] = "ack_tardy",
	[0x1c] = "-reserved-",		[0x1d] = "ack_data_error",
	[0x1e] = "ack_type_error",	[0x1f] = "-reserved-",
	[0x20] = "pending/cancelled",
};
static const char *tcodes[] = {
	[0x0] = "QW req",		[0x1] = "BW req",
	[0x2] = "W resp",		[0x3] = "-reserved-",
	[0x4] = "QR req",		[0x5] = "BR req",
	[0x6] = "QR resp",		[0x7] = "BR resp",
	[0x8] = "cycle start",		[0x9] = "Lk req",
	[0xa] = "async stream packet",	[0xb] = "Lk resp",
	[0xc] = "-reserved-",		[0xd] = "-reserved-",
	[0xe] = "link internal",	[0xf] = "-reserved-",
};

static void log_ar_at_event(struct fw_ohci *ohci,
			    char dir, int speed, u32 *header, int evt)
{
	int tcode = header[0] >> 4 & 0xf;
	char specific[12];

	if (likely(!(param_debug & OHCI_PARAM_DEBUG_AT_AR)))
		return;

	if (unlikely(evt >= ARRAY_SIZE(evts)))
			evt = 0x1f;

	if (evt == OHCI1394_evt_bus_reset) {
		dev_notice(ohci->card.device,
			   "A%c evt_bus_reset, generation %d\n",
			   dir, (header[2] >> 16) & 0xff);
		return;
	}

	switch (tcode) {
	case 0x0: case 0x6: case 0x8:
		snprintf(specific, sizeof(specific), " = %08x",
			 be32_to_cpu((__force __be32)header[3]));
		break;
	case 0x1: case 0x5: case 0x7: case 0x9: case 0xb:
		snprintf(specific, sizeof(specific), " %x,%x",
			 header[3] >> 16, header[3] & 0xffff);
		break;
	default:
		specific[0] = '\0';
	}

	switch (tcode) {
	case 0xa:
		dev_notice(ohci->card.device,
			   "A%c %s, %s\n",
			   dir, evts[evt], tcodes[tcode]);
		break;
	case 0xe:
		dev_notice(ohci->card.device,
			   "A%c %s, PHY %08x %08x\n",
			   dir, evts[evt], header[1], header[2]);
		break;
	case 0x0: case 0x1: case 0x4: case 0x5: case 0x9:
		dev_notice(ohci->card.device,
			   "A%c spd %x tl %02x, "
			   "%04x -> %04x, %s, "
			   "%s, %04x%08x%s\n",
			   dir, speed, header[0] >> 10 & 0x3f,
			   header[1] >> 16, header[0] >> 16, evts[evt],
			   tcodes[tcode], header[1] & 0xffff, header[2], specific);
		break;
	default:
		dev_notice(ohci->card.device,
			   "A%c spd %x tl %02x, "
			   "%04x -> %04x, %s, "
			   "%s%s\n",
			   dir, speed, header[0] >> 10 & 0x3f,
			   header[1] >> 16, header[0] >> 16, evts[evt],
			   tcodes[tcode], specific);
	}
}

static inline void reg_write(const struct fw_ohci *ohci, int offset, u32 data)
{
	writel(data, ohci->registers + offset);
}

static inline u32 reg_read(const struct fw_ohci *ohci, int offset)
{
	return readl(ohci->registers + offset);
}

static inline void flush_writes(const struct fw_ohci *ohci)
{
	/* Do a dummy read to flush writes. */
	reg_read(ohci, OHCI1394_Version);
}

/*
 * Beware!  read_phy_reg(), write_phy_reg(), update_phy_reg(), and
 * read_paged_phy_reg() require the caller to hold ohci->phy_reg_mutex.
 * In other words, only use ohci_read_phy_reg() and ohci_update_phy_reg()
 * directly.  Exceptions are intrinsically serialized contexts like pci_probe.
 */
static int read_phy_reg(struct fw_ohci *ohci, int addr)
{
	u32 val;
	int i;

	reg_write(ohci, OHCI1394_PhyControl, OHCI1394_PhyControl_Read(addr));
	for (i = 0; i < 3 + 100; i++) {
		val = reg_read(ohci, OHCI1394_PhyControl);
		if (!~val)
			return -ENODEV; /* Card was ejected. */

		if (val & OHCI1394_PhyControl_ReadDone)
			return OHCI1394_PhyControl_ReadData(val);

		/*
		 * Try a few times without waiting.  Sleeping is necessary
		 * only when the link/PHY interface is busy.
		 */
		if (i >= 3)
			msleep(1);
	}
	dev_err(ohci->card.device, "failed to read phy reg\n");

	return -EBUSY;
}

static int write_phy_reg(const struct fw_ohci *ohci, int addr, u32 val)
{
	int i;

	reg_write(ohci, OHCI1394_PhyControl,
		  OHCI1394_PhyControl_Write(addr, val));
	for (i = 0; i < 3 + 100; i++) {
		val = reg_read(ohci, OHCI1394_PhyControl);
		if (!~val)
			return -ENODEV; /* Card was ejected. */

		if (!(val & OHCI1394_PhyControl_WritePending))
			return 0;

		if (i >= 3)
			msleep(1);
	}
	dev_err(ohci->card.device, "failed to write phy reg\n");

	return -EBUSY;
}

static int update_phy_reg(struct fw_ohci *ohci, int addr,
			  int clear_bits, int set_bits)
{
	int ret = read_phy_reg(ohci, addr);
	if (ret < 0)
		return ret;

	/*
	 * The interrupt status bits are cleared by writing a one bit.
	 * Avoid clearing them unless explicitly requested in set_bits.
	 */
	if (addr == 5)
		clear_bits |= PHY_INT_STATUS_BITS;

	return write_phy_reg(ohci, addr, (ret & ~clear_bits) | set_bits);
}

static int read_paged_phy_reg(struct fw_ohci *ohci, int page, int addr)
{
	int ret;

	ret = update_phy_reg(ohci, 7, PHY_PAGE_SELECT, page << 5);
	if (ret < 0)
		return ret;

	return read_phy_reg(ohci, addr);
}

static int ohci_read_phy_reg(struct fw_card *card, int addr)
{
	struct fw_ohci *ohci = fw_ohci(card);
	int ret;

	mutex_lock(&ohci->phy_reg_mutex);
	ret = read_phy_reg(ohci, addr);
	mutex_unlock(&ohci->phy_reg_mutex);

	return ret;
}

static int ohci_update_phy_reg(struct fw_card *card, int addr,
			       int clear_bits, int set_bits)
{
	struct fw_ohci *ohci = fw_ohci(card);
	int ret;

	mutex_lock(&ohci->phy_reg_mutex);
	ret = update_phy_reg(ohci, addr, clear_bits, set_bits);
	mutex_unlock(&ohci->phy_reg_mutex);

	return ret;
}

static inline dma_addr_t ar_buffer_bus(struct ar_context *ctx, unsigned int i)
{
	return page_private(ctx->pages[i]);
}

static void ar_context_link_page(struct ar_context *ctx, unsigned int index)
{
	struct descriptor *d;

	d = &ctx->descriptors[index];
	d->branch_address  &= cpu_to_le32(~0xf);
	d->res_count       =  cpu_to_le16(PAGE_SIZE);
	d->transfer_status =  0;

	wmb(); /* finish init of new descriptors before branch_address update */
	d = &ctx->descriptors[ctx->last_buffer_index];
	d->branch_address  |= cpu_to_le32(1);

	ctx->last_buffer_index = index;

	reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_WAKE);
}

static void ar_context_release(struct ar_context *ctx)
{
	unsigned int i;

	if (ctx->buffer)
		vm_unmap_ram(ctx->buffer, AR_BUFFERS + AR_WRAPAROUND_PAGES);

	for (i = 0; i < AR_BUFFERS; i++)
		if (ctx->pages[i]) {
			dma_unmap_page(ctx->ohci->card.device,
				       ar_buffer_bus(ctx, i),
				       PAGE_SIZE, DMA_FROM_DEVICE);
			__free_page(ctx->pages[i]);
		}
}

static void ar_context_abort(struct ar_context *ctx, const char *error_msg)
{
	struct fw_ohci *ohci = ctx->ohci;

	if (reg_read(ohci, CONTROL_CLEAR(ctx->regs)) & CONTEXT_RUN) {
		reg_write(ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);
		flush_writes(ohci);

		dev_err(ohci->card.device, "AR error: %s; DMA stopped\n",
			error_msg);
	}
	/* FIXME: restart? */
}

static inline unsigned int ar_next_buffer_index(unsigned int index)
{
	return (index + 1) % AR_BUFFERS;
}

static inline unsigned int ar_prev_buffer_index(unsigned int index)
{
	return (index - 1 + AR_BUFFERS) % AR_BUFFERS;
}

static inline unsigned int ar_first_buffer_index(struct ar_context *ctx)
{
	return ar_next_buffer_index(ctx->last_buffer_index);
}

/*
 * We search for the buffer that contains the last AR packet DMA data written
 * by the controller.
 */
static unsigned int ar_search_last_active_buffer(struct ar_context *ctx,
						 unsigned int *buffer_offset)
{
	unsigned int i, next_i, last = ctx->last_buffer_index;
	__le16 res_count, next_res_count;

	i = ar_first_buffer_index(ctx);
	res_count = ACCESS_ONCE(ctx->descriptors[i].res_count);

	/* A buffer that is not yet completely filled must be the last one. */
	while (i != last && res_count == 0) {

		/* Peek at the next descriptor. */
		next_i = ar_next_buffer_index(i);
		rmb(); /* read descriptors in order */
		next_res_count = ACCESS_ONCE(
				ctx->descriptors[next_i].res_count);
		/*
		 * If the next descriptor is still empty, we must stop at this
		 * descriptor.
		 */
		if (next_res_count == cpu_to_le16(PAGE_SIZE)) {
			/*
			 * The exception is when the DMA data for one packet is
			 * split over three buffers; in this case, the middle
			 * buffer's descriptor might be never updated by the
			 * controller and look still empty, and we have to peek
			 * at the third one.
			 */
			if (MAX_AR_PACKET_SIZE > PAGE_SIZE && i != last) {
				next_i = ar_next_buffer_index(next_i);
				rmb();
				next_res_count = ACCESS_ONCE(
					ctx->descriptors[next_i].res_count);
				if (next_res_count != cpu_to_le16(PAGE_SIZE))
					goto next_buffer_is_active;
			}

			break;
		}

next_buffer_is_active:
		i = next_i;
		res_count = next_res_count;
	}

	rmb(); /* read res_count before the DMA data */

	*buffer_offset = PAGE_SIZE - le16_to_cpu(res_count);
	if (*buffer_offset > PAGE_SIZE) {
		*buffer_offset = 0;
		ar_context_abort(ctx, "corrupted descriptor");
	}

	return i;
}

static void ar_sync_buffers_for_cpu(struct ar_context *ctx,
				    unsigned int end_buffer_index,
				    unsigned int end_buffer_offset)
{
	unsigned int i;

	i = ar_first_buffer_index(ctx);
	while (i != end_buffer_index) {
		dma_sync_single_for_cpu(ctx->ohci->card.device,
					ar_buffer_bus(ctx, i),
					PAGE_SIZE, DMA_FROM_DEVICE);
		i = ar_next_buffer_index(i);
	}
	if (end_buffer_offset > 0)
		dma_sync_single_for_cpu(ctx->ohci->card.device,
					ar_buffer_bus(ctx, i),
					end_buffer_offset, DMA_FROM_DEVICE);
}

#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
#define cond_le32_to_cpu(v) \
	(ohci->quirks & QUIRK_BE_HEADERS ? (__force __u32)(v) : le32_to_cpu(v))
#else
#define cond_le32_to_cpu(v) le32_to_cpu(v)
#endif

static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
{
	struct fw_ohci *ohci = ctx->ohci;
	struct fw_packet p;
	u32 status, length, tcode;
	int evt;

	p.header[0] = cond_le32_to_cpu(buffer[0]);
	p.header[1] = cond_le32_to_cpu(buffer[1]);
	p.header[2] = cond_le32_to_cpu(buffer[2]);

	tcode = (p.header[0] >> 4) & 0x0f;
	switch (tcode) {
	case TCODE_WRITE_QUADLET_REQUEST:
	case TCODE_READ_QUADLET_RESPONSE:
		p.header[3] = (__force __u32) buffer[3];
		p.header_length = 16;
		p.payload_length = 0;
		break;

	case TCODE_READ_BLOCK_REQUEST :
		p.header[3] = cond_le32_to_cpu(buffer[3]);
		p.header_length = 16;
		p.payload_length = 0;
		break;

	case TCODE_WRITE_BLOCK_REQUEST:
	case TCODE_READ_BLOCK_RESPONSE:
	case TCODE_LOCK_REQUEST:
	case TCODE_LOCK_RESPONSE:
		p.header[3] = cond_le32_to_cpu(buffer[3]);
		p.header_length = 16;
		p.payload_length = p.header[3] >> 16;
		if (p.payload_length > MAX_ASYNC_PAYLOAD) {
			ar_context_abort(ctx, "invalid packet length");
			return NULL;
		}
		break;

	case TCODE_WRITE_RESPONSE:
	case TCODE_READ_QUADLET_REQUEST:
	case OHCI_TCODE_PHY_PACKET:
		p.header_length = 12;
		p.payload_length = 0;
		break;

	default:
		ar_context_abort(ctx, "invalid tcode");
		return NULL;
	}

	p.payload = (void *) buffer + p.header_length;

	/* FIXME: What to do about evt_* errors? */
	length = (p.header_length + p.payload_length + 3) / 4;
	status = cond_le32_to_cpu(buffer[length]);
	evt    = (status >> 16) & 0x1f;

	p.ack        = evt - 16;
	p.speed      = (status >> 21) & 0x7;
	p.timestamp  = status & 0xffff;
	p.generation = ohci->request_generation;

	log_ar_at_event(ohci, 'R', p.speed, p.header, evt);

	/*
	 * Several controllers, notably from NEC and VIA, forget to
	 * write ack_complete status at PHY packet reception.
	 */
	if (evt == OHCI1394_evt_no_status &&
	    (p.header[0] & 0xff) == (OHCI1394_phy_tcode << 4))
		p.ack = ACK_COMPLETE;

	/*
	 * The OHCI bus reset handler synthesizes a PHY packet with
	 * the new generation number when a bus reset happens (see
	 * section 8.4.2.3).  This helps us determine when a request
	 * was received and make sure we send the response in the same
	 * generation.  We only need this for requests; for responses
	 * we use the unique tlabel for finding the matching
	 * request.
	 *
	 * Alas some chips sometimes emit bus reset packets with a
	 * wrong generation.  We set the correct generation for these
	 * at a slightly incorrect time (in bus_reset_work).
	 */
	if (evt == OHCI1394_evt_bus_reset) {
		if (!(ohci->quirks & QUIRK_RESET_PACKET))
			ohci->request_generation = (p.header[2] >> 16) & 0xff;
	} else if (ctx == &ohci->ar_request_ctx) {
		fw_core_handle_request(&ohci->card, &p);
	} else {
		fw_core_handle_response(&ohci->card, &p);
	}

	return buffer + length + 1;
}

static void *handle_ar_packets(struct ar_context *ctx, void *p, void *end)
{
	void *next;

	while (p < end) {
		next = handle_ar_packet(ctx, p);
		if (!next)
			return p;
		p = next;
	}

	return p;
}

static void ar_recycle_buffers(struct ar_context *ctx, unsigned int end_buffer)
{
	unsigned int i;

	i = ar_first_buffer_index(ctx);
	while (i != end_buffer) {
		dma_sync_single_for_device(ctx->ohci->card.device,
					   ar_buffer_bus(ctx, i),
					   PAGE_SIZE, DMA_FROM_DEVICE);
		ar_context_link_page(ctx, i);
		i = ar_next_buffer_index(i);
	}
}

static void ar_context_tasklet(unsigned long data)
{
	struct ar_context *ctx = (struct ar_context *)data;
	unsigned int end_buffer_index, end_buffer_offset;
	void *p, *end;

	p = ctx->pointer;
	if (!p)
		return;

	end_buffer_index = ar_search_last_active_buffer(ctx,
							&end_buffer_offset);
	ar_sync_buffers_for_cpu(ctx, end_buffer_index, end_buffer_offset);
	end = ctx->buffer + end_buffer_index * PAGE_SIZE + end_buffer_offset;

	if (end_buffer_index < ar_first_buffer_index(ctx)) {
		/*
		 * The filled part of the overall buffer wraps around; handle
		 * all packets up to the buffer end here.  If the last packet
		 * wraps around, its tail will be visible after the buffer end
		 * because the buffer start pages are mapped there again.
		 */
		void *buffer_end = ctx->buffer + AR_BUFFERS * PAGE_SIZE;
		p = handle_ar_packets(ctx, p, buffer_end);
		if (p < buffer_end)
			goto error;
		/* adjust p to point back into the actual buffer */